condition mean min max ZT0-3 22.6 22.6 22.6 ZT4-7 4.8 4.8 4.8 ZT8-11 61.65 61.65 61.65 ZT12-15 59.150000000000006 59.150000000000006 59.150000000000006 ZT16-19 29.45 29.45 29.45 ZT20-23 62.8 62.8 62.8